The 70-year-old artist tagged Indian foreign minister Sushma Swaraj and the Indian high commission in London, among others.

Khan, who has done extensive UK tours including special performances for The Prince of Wales, is slated to perform at the prestigious Royal Festival Hall, which is located at the heart of Southbank Centre in London.

"The moment you are Khan or Ali, these issues come up. I haven't been given a reason for the rejection. There never is. But a lot, I think, has to do with the current situation in the world," he told Indian Express.